President Barack Obama hugs his daughter Sasha as he walks with Malia as they leave St. John's Episcopal Church to walk across Lafayette Park as they return to the White House in Washington, on Sunday, Oct. 28, 2012. (Jacquelyn Martin / AP Photo) less

President Barack Obama hugs his daughter Sasha as he walks with Malia as they leave St. John's Episcopal Church to walk across Lafayette Park as they return to the White House in Washington, on Sunday, Oct. 28, ... more

Republican presidential candidate and former Massachusetts Gov. Mitt Romney, left, is introduced by his son Matt before he speaks at a campaign fundraising event in Del Mar, Calif., Saturday, Sept. 22, 2012. (Charles Dharapak / AP Photo) less

Republican presidential candidate and former Massachusetts Gov. Mitt Romney, left, is introduced by his son Matt before he speaks at a campaign fundraising event in Del Mar, Calif., Saturday, Sept. 22, 2012. ... more

Republican presidential candidate, former Massachusetts Gov. Mitt Romney poses for photographs with students of Fairfield Elementary School after stopping at their school to greet them, Monday, Oct. 8, 2012, in Fairfield, Va. less

Republican presidential candidate, former Massachusetts Gov. Mitt Romney poses for photographs with students of Fairfield Elementary School after stopping at their school to greet them, Monday, Oct. 8, 2012, in ... more

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, third from left, waits in line to order dinner at BurgerFi on Sunday, Oct. 21, 2012 in Delray Beach, Fla. From left, son Craig, wife Ann, Romney, and grandson Parker. less

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, third from left, waits in line to order dinner at BurgerFi on Sunday, Oct. 21, 2012 in Delray Beach, Fla. From left, son Craig, wife ... more

Republican vice presidential candidate, Rep. Paul Ryan, R-Wis., talks to his daughter, Liza, and son, Sam, about the stadium astroturf at a Bowling Green State University and Miami University of Ohio football game, Saturday, Oct. 13, 2012 in Bowling Green, Ohio. (Mary Altaffer / AP Photo) less

Republican vice presidential candidate, Rep. Paul Ryan, R-Wis., talks to his daughter, Liza, and son, Sam, about the stadium astroturf at a Bowling Green State University and Miami University of Ohio football ... more

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left and running mate Rep. Paul Ryan, R-Wis., talk in the campaign bus before an event at the Waukesha county expo center, Sunday, Aug. 12, 2012 in Waukesha, Wis. less

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left and running mate Rep. Paul Ryan, R-Wis., talk in the campaign bus before an event at the Waukesha county expo center, Sunday, Aug. ... more

First Lady Michelle Obama turns and runs after catching a pass while participating in the Let's Move! Campaign and the NFL's Play 60 Campaign festivities with area youth in New Orleans in this Sept. 8, 2010 file photo. (Gerald Herbert / AP Photo) less

First Lady Michelle Obama turns and runs after catching a pass while participating in the Let's Move! Campaign and the NFL's Play 60 Campaign festivities with area youth in New Orleans in this Sept. 8, 2010 ... more

Ann Romney works the phones during a surprise appearance at the Republican Party of Orange County Victory Office on Saturday, Oct. 6, 2012 in Orlando, Fla. (Joe Burbank / AP Photo)

Ann Romney works the phones during a surprise appearance at the Republican Party of Orange County Victory Office on Saturday, Oct. 6, 2012 in Orlando, Fla.
(Joe Burbank / AP Photo)

Ann Romney works the phones during a surprise appearance at the... Photo-3693827.51899 - SFGate

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Taboola Gallery Frame Item-85307.51899 - SFGate

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First lady Michelle Obama signs copies of her book "American Grown: The Story of the White House Kitchen Garden and Garden Across America," in Washington, Tuesday, June 12, 2012. (Jacquelyn Martin / AP Photo) less

First lady Michelle Obama signs copies of her book "American Grown: The Story of the White House Kitchen Garden and Garden Across America," in Washington, Tuesday, June 12, 2012. (Jacquelyn Martin / ... more